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ARM: 9197/1: spectre-bhb: fix loop8 sequence for Thumb2

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[ Upstream commit 3cfb3019979666bdf33a1010147363cf05e0f17b ]

In Thumb2, 'b . + 4' produces a branch instruction that uses a narrow
encoding, and so it does not jump to the following instruction as
expected. So use W(b) instead.

Fixes: 6c7cb60bff7a ("ARM: fix Thumb2 regression with Spectre BHB")
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ard Biesheuvel 2022-04-20 09:46:17 +01:00 • committed by Greg Kroah-Hartman
commit eb92a8ecce
1 changed files with 1 additions and 1 deletions
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arch/arm/kernel/entry-armv.S
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@ -1043,7 +1043,7 @@ vector_bhb_loop8_\name:
@ bhb workaround
mov r0, #8
3: b . + 4
3: W(b) . + 4
subs r0, r0, #1
bne 3b
dsb